For the PokeCommunity Stadium 2 (PvE Autobattle) Get-Together 2023 Event.

General items
Black Belt: Holder's Fighting-type attacks have 1.1x power.
Black Glasses: Holder's Dark-type attacks have 1.1x power.
Bright Powder: An attack against the holder has its accuracy out of 255 lowered by 20.
Charcoal: Holder's Fire-type attacks have 1.1x power.
Dragon Scale: Holder's Dragon-type attacks have 1.1x power. Evolves Seadra (trade).
Focus Band: Holder has a ~11.7% chance to survive an attack that would KO it with 1 HP.
Hard Stone: Holder's Rock-type attacks have 1.1x power.
King's Rock: Holder's attacks without a chance to flinch gain a 10% chance to flinch.
Leftovers: At the end of every turn, holder restores 1/16 of its max HP.
Magnet: Holder's Electric-type attacks have 1.1x power.
Mail: Cannot be given to or taken from a Pokemon, except by Covet/Knock Off/Thief.
Metal Coat: Holder's Steel-type attacks have 1.1x power.
Miracle Seed: Holder's Grass-type attacks have 1.1x power.
Mystic Water: Holder's Water-type attacks have 1.1x power.
Never-Melt Ice: Holder's Ice-type attacks have 1.1x power.
Pink Bow: Holder's Normal-type attacks have 1.1x power.
Poison Barb: Holder's Poison-type attacks have 1.1x power.
Polkadot Bow: Holder's Normal-type attacks have 1.1x power.
Quick Claw: Each turn, holder has a ~23.4% chance to move first in its priority bracket.
Scope Lens: Holder's critical hit ratio is raised by 1 stage.
Sharp Beak: Holder's Flying-type attacks have 1.1x power.
Silver Powder: Holder's Bug-type attacks have 1.1x power.
Soft Sand: Holder's Ground-type attacks have 1.1x power.
Spell Tag: Holder's Ghost-type attacks have 1.1x power.
Twisted Spoon: Holder's Psychic-type attacks have 1.1x power.

Single Use Items
Berry: Restores 10 HP when at 1/2 max HP or less. Single use.
Berry Juice: Restores 20 HP when at 1/2 max HP or less. Single use.
Berserk Gene: On switch-in, raises holder's Attack by 2 and confuses it. Single use.
Bitter Berry: Holder is cured if it is confused. Single use.
Burnt Berry: Holder is cured if it is frozen. Single use.
Gold Berry: Restores 30 HP when at 1/2 max HP or less. Single use.
Ice Berry: Holder is cured if it is burned. Single use.
Mint Berry: Holder wakes up if it is asleep. Single use.
Miracle Berry: Holder cures itself if it is confused or has a status condition. Single use.
Mystery Berry: Restores 5 PP to the first of the holder's moves to reach 0 PP. Single use.
PRZ Cure Berry: Holder cures itself if it is paralyzed. Single use.
PSN Cure Berry: Holder is cured if it is poisoned. Single use.

Pokémon-specific Items
Light Ball: If held by a Pikachu, its Special Attack is doubled.
Lucky Punch: If held by a Chansey, its critical hit ratio is always at stage 2. (25% crit rate)
Metal Powder: If held by a Ditto, its Defense and Sp. Def are 1.5x, even while Transformed.
Stick: If held by a Farfetch’d, its critical hit ratio is always at stage 2. (25% crit rate)
Thick Club: If held by a Cubone or a Marowak, its Attack is doubled.